Inverted-mantle lamp.



P. M. BROOKS. INVEBTED MANTLE LAMP. APPLIOATIOII rrpnn .TUHB 1, 1010.

Patented Dec. 13,1910.

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. UNITED STATES PATENT OFFICE.

FRANK M. BROOKS, OF NEW YORK, N. Y.

INVERTED-MANTLE LAMP.

Application filed June 7, 1910.

To all whom it may concern:

Be it known that I,.Fnxnn M. BROOKS, a citizen of the United States, anda resident of the borough of Brooklyn, county of Kings, city and Stateof New York, have invented certain new and useful Improvements-inInverted-Mantle Lamps, of which the following is a specification,reference being had to the accompanying drawings, in Which- Figure 1illustrates a vertical sectional view of the invention, the interiorparts of the lamp being shown in elevation; Fig. 2 illustrates a planview in section taken on the line 11 of Fig. 1.

This invention relates to an improvement in inverted mantle lamps, theparts of which can be assembled readily and economically and which willpermit interchanging of the parts, thus contributing to prompt andinexpensive repair, if such be necessary, whereby also the various partsmay be readily cleaned.

The invention is adapted to lamps having any preferred number of burnersand a very important feature in the construction is an air chamberlocated in the upper part of the lamp, in which air-chamber the airinlets in the Bunsen burner tubes are located, and connected with thisair chamber are pipes or equivalent conduits for conveying air thereto,said tubes being so arranged as to convey only fresh air, rich inoxygen, to the chamber and thence to the Bunsen burner tubes. The airchamber has attached to it at or near its upper part gas inlets for theseveral Bunsen burners which may or may not be fitted with regulatingneedle valves, as preferred.

In the construction of lamps of this character, efforts have heretoforebeen made to dispose of the products of combustion resulting from theburning of the gas, so that such products will not be drawn into theBunsen tubes, since they are unfit for further combustion and impair theoperation of the lamp. Most efforts of this kind, so

far as I am aware, have been only partially successful.

During a series of experiments I have discovered that an air chamberentirely closed can be located in the heated zone of the lamp, and ifair pipes or conduits be so ar ranged as to convey fresh air, (that is,air not contaminated with the products of previous combustion andconsequently rich in Specification of Letters Patent.

Patented Dec. 13, 1910.

Serial No. 565,568.

oxygen, even if such air should be highly heated) to the air chamber andthe Bunsen tubes be connected with the interior of said chamber, thatthen the supply of air for admixture with the incoming gas being rich inoxygen and free from the objectionable products of the previouscombustion, a greatly improved light at the burners will result. I havealso discovered that when a globe entirely closed at the bottom is usedon a lamp of this description in conjunction with an interior funnel,that then the air pipes or conduits above referred to, ifmade to receivethe fresh air from the space between the globe and the funnel, insure asteady supply of uncontaminated air, be-

cause the funnel causes all of the foul air to rise and escape from thelamp above the 1nlet of the fresh air and there is no way by which itcan be drawn back into the globe chamber again. Locating the lower endof the air conduits in the globe chamber also prevents the fresh airsupply being affected by wind drafts, thus insuring steadiness of thelight. There are other makes of lamps of this general character, whichhave the fresh air supply in various forms drawn from outside the lampbut immediately above the globe chamber. They have the disadvantage ofsometimes drawing in some of the contaminated air and being subject towind drafts, causing unsteadiness in the light. The location of thelower end of the air conduits in a space between the globe and aninterior funnel distinguishes my lamp from any other, so far as I know.

Referring to the drawings hereof, 1 represents the usual screw threadedconnection whereby the lamp may be connected with the gas pipe, 2 thehood of the lamp, 3 the globe which is continuous throughout, that isto. say, it has no opening below, 4L the usual thumb screws whereby theglobe is held to an outwardly projecting part 5 of the lamp structure,as shown.

(5 and 7 are series of holes made in the part 5.

8 is a cylindrical funnel the lower part of which flares outwardly asshown. It is connected at its upper edge to an annular ring 9 whichcloses the space between the hood 2 of the lamp and the upper part ofthe funnel.

10 is a partition which extends across the upper part of the lamp andtogether with another partition 11 at the upper rim of the lampconstitutes a comparatively tight chamber 12 in the upper part of thelamp.

13 is the usual pilot light tube provided with needle valve 14.

15 are the Bunsen burner tubes provided with vitrified or equivalentmantle holders 16 and with air inlet ports 17, the latter being locatedin the chamber 12. 18 are the mantles. The Bunsen burner tubes arepreferably provided with the usual gas regulating valves or cut ofi's19.

20 are air pipes or other suitable air conduits which open through thering 9 immediately above the holes 7, extend upwardly and pass throughthe partition 10 and open into the chamber-12.

It will be noted that the air which enters through the holes 6 and 7will follow two courses, one, that indicated by the arrows 21, in whichit passes downwardly and around the lower edge of the flaring funnel andsupplies air for the proper combustion of the gas on the outside of themantles and rising thence, passes out of the lamp through the openings22 made in the lamp body or hood, as usual. The other course taken bythe air is indicated by the arrow 23, in which after entering throughthe holes 6 and 7, it passes upwardly through the pipes, or equivalentair ducts 20, and is discharged into the chamber 12, from which it isdrawn into the Bunsen tubes through the openings 17 therein, and thencepasses downwardly to the burners on the lower end of the tubes.

Although I prefer that the structure should embody the ring 9, and thatthe air pipes or conduits 20 should extend through openings made in thisring, so as to make direct connection with the space between the globeand the funnel 8, nevertheless it is not essential that thisconstruction should be adhered to, because if the-pipes or conduits 20open into the space between the funnel and the globe, the upper part ofwhich space is between the upper part of the funnel and the hood of thelamp, or if the pipes or conduits extend downwardly only so far as thattheir lower ends shall be adjacent to but above openings made in thering, if it be present, still measurably satisfactory results willfollow because the upward rush of the products of combustion through thefunnel and out through the openings 22 in the hood is such that underordinary conditions, among them those in which the lamp is not subjectedto pronounced air drafts, there will be little, if any, of the productsof combustion drawn into the pipes or conduits, 20.

It will be seen that by my invention I accomplish the followingdesirable results,

i l partly referred to above.

First: The burners are supplied with fresh air rich in oxygen and freefrom products of combustion. v

Second: The globe of the lamp has no opening in it. This is a verydesirable feature not only for the reasons above stated, but also thatthe mantles, if dislocated or broken, cannot fall through the globe,which would be the case if it had an opening in its bottom.

Third: The pilot light is protected against all influences which mightextinguish it.

Fourth: The location of the pipes or con duits which supply the freshair to the air chamber being near the outer wall of the hood of thelamp, space is afforded in which a funnel may be placed nearer thecenter of the hood, whereby the air currents are controlled and directedas described, and the perforations at the side of the hood permit theescape of the heat generated by the lamp, without affecting the airchamber. This is an important feature of the invention.

Fifth: The air pipes being located so that their lower ends open intothe quiet and rotected space between the globe and the nnel, wind draftsor air currents cannot affect,

either to increase or reduce, the supply of air, thus maintaining asteady light.

Lastly: The construction is unusually practical and economical for alamp of this class.

It will be obvious to those who are familiar with such matters that thedetails of construction described and illustrated by me may be veryextensively departed'from and still the essentials of my invention beavailed of. I therefore do not limit myself to such details.

I claim: I

In an inverted mantle lamp, a body part or hood, a continuous globe, afunnel inside of but separated from the globe, the body part or hoodhaving air inlet holes opening into the space between the globe and thefunnel, and outlets for the products of combustion immediately above thetop of the funnel, a closed chamber in the upper part of the hood,Bunsen burner tubes locatedinside of the funnel, the air inlet ports ofwhich are within the chamber, means to confine and to conduct pure airfrom the space between the globe and. the funnel to the chamber, andsupply pipes for each Bunsen burner tube outside of the lamp.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANK M. BROOKS.

"Witnesses FLORA M. DONSBAGH, CORNELIUS P. MCLAUGHLIN.

